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https://www.readbyqxmd.com/read/28335452/fabrication-and-water-treatment-application-of-carbon-nanotubes-cnts-based-composite-membranes-a-review
#1
REVIEW
Lining Ma, Xinfa Dong, Mingliang Chen, Li Zhu, Chaoxian Wang, Fenglin Yang, Yingchao Dong
Membrane separation technology is widely explored for various applications, such as water desalination and wastewater treatment, which can alleviate the global issue of fresh water scarcity. Specifically, carbon nanotubes (CNTs)-based composite membranes are increasingly of interest due to the combined merits of CNTs and membrane separation, offering enhanced membrane properties. This article first briefly discusses fabrication and growth mechanisms, characterization and functionalization techniques of CNTs, and then reviews the fabrication methods for CNTs-based composite membranes in detail...
March 18, 2017: Membranes
https://www.readbyqxmd.com/read/28335393/solvent-retention-capacities-of-oat-flour
#2
Qianwen Niu, Yu Pu, Xiaoping Li, Zhen Ma, Xinzhong Hu
This study measured the solvent retention capacities (SRCs) of flours from eight oat varieties and one wheat variety against different solvents to explore the swelling volume of oat flour with different solvents, and thus provide a theoretical basis for quick β-glucan analysis. The SRC profile consists of water SRC (WSRC), 50% sucrose SRC (SSRC), 5% lactic acid SRC (LASRC), 5% Na₂CO₃ SRC (SCASRC), NaCl SRC (SCSRC), CaCl₂ SRC (CCSRC), FeCl₃ SRC (FCSRC), sodium cholate SRC (SCHSRC), NaOH (pH 10) SRC (SHSRC), Na₂CO₃ (pH 10) SRC (SCABSRC) and SDS (pH 10) SRC (SDSSRC) values, and a Chopin SRC kit was used to measure the SRC value...
March 13, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28335390/a-simple-metallothionein-based-biosensor-for-enhanced-detection-of-arsenic-and-mercury
#3
Gordon W Irvine, Swee Ngin Tan, Martin J Stillman
Metallothioneins (MTs) are a family of cysteine-rich proteins whose biological roles include the regulation of essential metal ions and protection against the harmful effects of toxic metals. Due to its high affinity for many toxic, soft metals, recombinant human MT isoform 1a was incorporated into an electrochemical-based biosensor for the detection of As(3+) and Hg(2+). A simple design was chosen to maximize its potential in environmental monitoring and MT was physically adsorbed onto paper discs placed on screen-printed carbon electrodes (SPCEs)...
March 13, 2017: Biosensors
https://www.readbyqxmd.com/read/28335346/a-facile-method-to-in-situ-synthesize-porous-ni%C3%A2-geo%C3%A2-nano-sheets-on-nickel-foam-as-advanced-anode-electrodes-for-li-ion-batteries
#4
Delong Ma, Xiaomin Shi, Anming Hu
A strategy for growth of porous Ni₂GeO₄ nanosheets on conductive nickel (Ni) foam with robust adhesion as a high-performance electrode for Li-ion batteries is proposed and realized, through a facile two-step method. It involves the low temperature hydro-thermal synthesis of bimetallic (Ni, Ge) hydroxide nanosheets precursor on Ni foam substrates and subsequent thermal transformation to porous Ni₂GeO₄ nanosheets. The as-prepared Ni₂GeO₄ nanosheets possess many interparticle mesopores with a size range from 5 to 15 nm...
November 19, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335333/plant-mediated-green-synthesis-of-cuo-nanoparticles-comparison-of-toxicity-of-engineered-and-plant-mediated-cuo-nanoparticles-towards-daphnia-magna
#5
Sadia Saif, Arifa Tahir, Tayyaba Asim, Yongsheng Chen
Research on green production methods for metal oxide nanoparticles (NPs) is growing, with the objective to overcome the potential hazards of these chemicals for a safer environment. In this study, facile, ecofriendly synthesis of copper oxide (CuO) nanoparticles was successfully achieved using aqueous extract of Pterospermum acerifolium leaves. P. acerifolium-fabricated CuO nanoparticles were further characterized by UV-Visible spectroscopy, field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray (EDX), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and dynamic light scattering (DLS)...
November 9, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335306/ionic-adsorption-and-desorption-of-cnt-nanoropes
#6
Jun-Jun Shang, Qing-Sheng Yang, Xiao-Hui Yan, Xiao-Qiao He, Kim-Meow Liew
A nanorope is comprised of several carbon nanotubes (CNTs) with different chiralities. A molecular dynamic model is built to investigate the ionic adsorption and desorption of the CNT nanoropes. The charge distribution on the nanorope is obtained by using a modified gradient method based on classical electrostatic theory. The electrostatic interactions among charged carbon atoms are calculated by using the Coulomb law. It was found here that the charged nanorope can adsorb heavy metal ions, and the adsorption and desorption can be realized by controlling the strength of applied electric field...
September 28, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335286/enhanced-end-contacts-by-helium-ion-bombardment-to-improve-graphene-metal-contacts
#7
Kunpeng Jia, Yajuan Su, Jun Zhan, Kashif Shahzad, Huilong Zhu, Chao Zhao, Jun Luo
Low contact resistance between graphene and metals is of paramount importance to fabricate high performance graphene-based devices. In this paper, the impact of both defects induced by helium ion (He⁺) bombardment and annealing on the contact resistance between graphene and various metals (Ag, Pd, and Pt) were systematically explored. It is found that the contact resistances between all metals and graphene are remarkably reduced after annealing, indicating that not only chemically adsorbed metal (Pd) but also physically adsorbed metals (Ag and Pt) readily form end-contacts at intrinsic defect locations in graphene...
August 26, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335258/nanostructures-derived-from-starch-and-chitosan-for-fluorescence-bio-imaging
#8
Yinxue Zu, Jingran Bi, Huiping Yan, Haitao Wang, Yukun Song, Bei-Wei Zhu, Mingqian Tan
Fluorescent nanostructures (NSs) derived from polysaccharides have drawn great attention as novel fluorescent probes for potential bio-imaging applications. Herein, we reported a facile alkali-assisted hydrothermal method to fabricate polysaccharide NSs using starch and chitosan as raw materials. Transmission electron microscopy (TEM) demonstrated that the average particle sizes are 14 nm and 75 nm for starch and chitosan NSs, respectively. Fourier transform infrared (FT-IR) spectroscopy analysis showed that there are a large number of hydroxyl or amino groups on the surface of these polysaccharide-based NSs...
July 5, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28334691/dna-functionalized-photonic-crystal-microspheres-for-multiplex-detection-of-toxic-metal-ions
#9
Zhengyu Yan, Chunqing Tian, Xincheng Qu, Weiyang Shen, Baofen Ye
A novel type of suspension array for multiplex detection of heavy metal ions with photonic crystal hydrogel microspheres was reported. The photonic crystal hydrogel microspheres have close-packed photonic crystal particles as their encoding units and ssDNA-functionalized hydrogel as the sensing units. The developed microspheres were successfully applied in multiplex detection of heavy metal ions.
March 8, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28334522/microwave-assisted-morphology-evolution-of-fe-based-metal-organic-frameworks-and-their-derived-fe2o3-nanostructures-for-li-ion-storage
#10
Wenxiang Guo, Weiwei Sun, Li-Ping Lv, Shaofeng Kong, Yong Wang
Metal-organic-framework (MOF) approach is demonstrated as an effective strategy for the morphology evolution control of MIL-53(Fe) with assistance of microwave irradiation. Owing to the homogenous nucleation offered by microwave irradiation and confined porosity and skeleton by MOF templates, various porous Fe2O3 nanostructures including spindle, concave octahedron, solid octahedron, yolk-shell octahedron, and nanorod with porosity control are derived by simply adjusting irradiation time. The formation mechanism for the MOF precursors and their derived iron oxides with morphology control are investigated...
March 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28334479/signal-induced-release-of-guests-from-a-photolatent-metal-phenolic-supramolecular-cage-and-its-hybrid-assemblies
#11
Chiyoung Park, Beom Joo Yang, Ki Beom Jeong, Chae Bin Kim, Seunghyun Lee, Bon-Cheol Ku
The coordination chemistry of plant polyphenols and metal ions can be used for coating various substrates and for creating modular superstructures. We herein explored this chemistry for the controlled release of guests from mesoporous silica nanoparticles (MSNs). The selective adsorption of tannic acids (TAs) on MSN silica walls opens the MSN mesoporous channels without disturbing mass transport. The channel may be closed by the coordination of TA with Cu(II) ions. Upon exposure to light, photolysis of Trojan horse guests (photoacid generators, PAGs) leads to acid generation, which enables the release of payloads by decomposing the outer coordination shell consisting of TA and Cu(II) ...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28333464/quantification-of-thermodynamic-hydridicity-of-hydride-complexes-of-mn-re-mo-and-w-using-molecular-electrostatic-potential
#12
Sandhya Karakkadparambil Sankaran, Cherumuttathu H Suresh
Molecular electrostatic potential (MESP) at the hydride nucleus, VH is proposed as a powerful measure of the hydride donor ability (hydridicity) of metal hydride complexes. The VH alues are determined for several group VI and group VII octahedral metal hydride complexes of Mo, W, Mn and Re at the B3LYP level of DFT. Further, the hydridicity, defined by the thermodynamic parameter ΔG(o)H- is determined for all these complexes using a thermodynamic cycle which describes the hydride abstraction reaction by H3O(+) ion...
March 23, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28333452/mixed-lanthanide-porous-coordination-polymers-showing-range-tunable-ratiometric-luminescence-for-o2-sensing
#13
Jia-Wen Ye, Jiao-Min Lin, Zong-Wen Mo, Chun-Ting He, Hao-Long Zhou, Jie-Peng Zhang, Xiao-Ming Chen
Luminescent porous coordination polymers (PCPs) are emerging as attractive oxygen-sensing materials, but they are mostly based on single-wavelength luminometry. Here, we report a special mixed-lanthanide strategy for self-referenced ratiometric oxygen sensing. A series of isostructural, pure-lanthanide, or mixed-lanthanide PCPs, MCF-53(Tb/Eux), were synthesized by solvothermal reactions. Single-crystal X-ray diffraction revealed that MCF-53(Tb/Eux) is composed of complicated two-dimensional coordination networks, which interdigitate to form a three-dimensional supramolecular structure retaining one-dimensional ultra-micropores...
March 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28333445/metallo-organic-ligand-designing-road-for-constructing-the-first-generation-dendritic-metallotriangle
#14
Tun Wu, Yu-Sheng Chen, Mingzhao Chen, Qianqian Liu, Xiaobo Xue, Yixian Shen, Jun Wang, Han Huang, Yi-Tsu Chan, Pingshan Wang
Three approaches have been carefully examined in order to develop a terpyridine-based dendritic metallotriangle: (1) direct self-assembly of two types of organic polyterpyridines with metal ions; (2) assembly of flexible metallo-organic ligands containing two uncomplexed free terpyridines with a possible 60°-V-shaped orientation; (3) assembly of functionalized metallotriangles possessing a fixed 60°-bent uncoordinated bisterpyridine. Only the third approach has successfully given rise to the desired first-generation dendritic metallotriangle...
March 23, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28332828/garnet-type-fast-li-ion-conductors-with-high-ionic-conductivities-for-all-solid-state-batteries
#15
Jian-Fang Wu, Wei Kong Pang, Vanessa K Peterson, Lu Wei, Xin Guo
All-solid-state Li-ion batteries with metallic Li anodes and solid electrolytes could offer superior energy density and safety over conventional Li-ion batteries. However, compared with organic liquid electrolytes, the low conductivity of solid electrolytes and large electrolyte/electrode interfacial resistance impede their practical application. Garnet-type Li-ion conducting oxides are amongst the most promising electrolytes for all-solid-state Li-ion batteries. In this work, the large radius Rb is doped at the La site of cubic Li6...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332814/hf-free-electroless-deposition-of-metals-on-silicon-in-ionic-liquids-and-its-enhanced-performance-in-lithium-storage
#16
Abhishek Lahiri, Tianqi Lu, Niklas Behrens, Natalia Borisenko, Guozhu Li, Frank Endres
Metal nanoparticles such as Au, Ag, Pt etc. have been deposited on silicon by electroless deposition in the presence of HF for applications such as oxygen reduction reaction, surface enhanced Raman spectroscopy as well as for lithium ion batteries. Here, we show a HF-free process wherein metals such as Sb and Ag could be deposited onto electrodeposited silicon in ionic liquids. We further show that compared to electrodeposited silicon, Sb modified Si demonstrates a better performance for lithium storage. The present study opens up new paradigm for electroless deposition technique in ionic liquids for developing and modifying functional materials...
March 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28332759/structural-adaptation-of-a-protein-to-increased-metal-stress-nmr-structure-of-a-marine-snail-metallothionein-with-an-additional-domain
#17
Christian Baumann, Andrea Beil, Simon Jurt, Michael Niederwanger, Oscar Palacios, Mercè Capdevila, Sílvia Atrian, Reinhard Dallinger, Oliver Zerbe
In this study, we present an NMR structure of the metallothionein (MT) from the snail Littorina littorea (LlMT) in complex with Cd(2+) . LlMT is capable of binding 9 Zn(2+) or 9 Cd(2+) ions. Sequence alignments with other snail MTs revealed that the protein is likely composed of three domains. The study revealed that the protein is divided into three individual domains, each of which folds into a single well-defined three-metal cluster. The central α2 and C-terminal β domains are positioned with a unique relative orientation...
March 23, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28332673/hierarchical-porous-nico2o4-nanosheet-arrays-directly-grown-on-carbon-cloth-with-superior-lithium-storage-performance
#18
Li Zhao, Lei Wang, Peng Yu, Chungui Tian, He Feng, Zhongwei Diao, Honggang Fu
Binary metal oxides have been explored as advanced candidates in lithium-ion battery (LIB) anodes due to their high specific capacity. Herein, the hierarchical structures of porous NiCo2O4 nanosheets directly grown on a conductive carbon cloth substrate (3D NCO-PSA/CC) were obtained by a facile in situ synthetic strategy. When applied as a binder-free LIB anode, it exhibited satisfactory performance with a high discharge capacity (a first discharge capacity of 2090.8 mA h g(-1) and a stable capacity of 1687...
March 23, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28332602/silver-metal-nano-matrixes-as-high-efficiency-and-versatile-catalytic-reactors-for-environmental-remediation
#19
Ludovic F Dumée, Zhifeng Yi, Blaise Tardy, Andrea Merenda, Elise des Ligneris, Ray R Dagastine, Lingxue Kong
Nano-porous metallic matrixes (NMMs) offer superior surface to volume ratios as well as enhanced optical, photonic, and electronic properties to bulk metallic materials. Such behaviours are correlated to the nano-scale inter-grain metal domains that favour the presence of electronic vacancies. In this work, continuous 3D NMMs were synthesized for the first time through a simple diffusion-reduction process whereby the aerogel matrix was functionalized with (3-Mercaptopropyl)trimethoxysilane. The surface energy of the silica monolith templates was tuned to improve the homogeneity of the reduction process while thiol functionalization facilitated the formation of a high density of seeding points for metal ions to reduce...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332174/effects-of-carbon-nanotube-and-biochar-on-bioavailability-of-pb-cu-and-sb-in-multi-metal-contaminated-soil
#20
Meththika Vithanage, Indika Herath, Yaser A Almaroai, Anushka Upamali Rajapaksha, Longbin Huang, Jwa-Kyung Sung, Sang Soo Lee, Yong Sik Ok
This study examined the effects of carbon nanotube and biochar on the bioavailability of Pb, Cu and Sb in the shooting range soils for developing low-cost remediation technology. Commercially available multi-walled carbon nanotube (MWCNT) and biochar pyrolyzed from soybean stover at 300 °C (BC) at 0.5, 1 and 2.5% (w w(-1)) were used to remediate the contaminated soil in an incubation experiment. Both DTPA (bioavailable) and TCLP (leaching) extraction procedures were used to compare the metal/loid availability and leaching by the amendments in soil...
March 22, 2017: Environmental Geochemistry and Health
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